3 things to keep in mind, no mater what someone says.
1. What is the max weight the toy hauler can carry? (gear,food, water,fuel in tanks included)
2. What is the max weight the ramp can handle?
3. The big one, what can your tow vehicle tow?
Be absolutely sure of what the car weighs with gas and all the fluids in it.
These all can make the camper or truck handle badly, something else to think of if its not a convertible, can you get out when inside?